Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3851497eb200687…

MALICIOUS

PDF

41.0 KB Created: 2020-11-09 11:39:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 0f05f07e0ca80a09516d6c68d38c73b8 SHA-1: afef96f888d3626f5f762eb49f097a465b1ffefb SHA-256: a3851497eb200687c8064b8a1c2a848295a267a481ec18a82c9647d1311a2d14
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffi.ru/aws?keyword=asea+2020+annual+conference PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371809/normal_5f8d15c39804f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_5f9b2921d00d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378167/normal_5f8bb3ad12aef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445864/normal_5f9fb40441665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408721/normal_5f9defda39ed0.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/busixakowun_zefisuni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/gasutemofikekesat.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/57539222151.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/steelers_vs_ravens_live_streaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a0b0d3b-c289-4145-9e36-27d38fb01266/91086555293.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/kijimasonusolipijixegev.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/diferencia_entre_equidad_e_igualdad.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F59 5140 bytes
SHA-256: 03f85a69a3cb909d25711597a7d451d4ca51ec4551402a9e7e6438fcfed8645d
font_01_sfnt_off000070df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70DF 11428 bytes
SHA-256: fb827103429b7e51065d23219784fc198933fb6bd81b2acf099f85d2c9e149fb